class IsoscelesTriangle {
    float length = 5;
    float bottom = 8;
    float height = 3;
    float area;
    float computerArea() {
        area = (height * bottom)/2;
        System.out.printf("等腰三角形的面积是:",area);
        return area;
    }
    public void circumference(float length,float bottom) {
    float C = bottom + (length*2);
    System.out.printf("等腰三角形的周长是:",C);
    }
    public void Angle(int length,int bottom) {
        int Ang = (2*length^2 - bottom^2)/2*length^2;
        System.out.println("等腰三角形顶角的角度是:"+Ang);
    }
}